基于状态反馈的低风速风电机组不平衡载荷控制方法研究

Unbalanced load control method for low speed wind turbine based on state feedback

针对1P载荷控制只能减小叶片载荷的1P谐波分量和轮毂载荷的0P谐波分量但对高频振动没有抑制能力的问题,采用2P载荷控制策略,对风电机组的动力学特性及其等效线性化模型进行研究,推导出风力机的动力学方程与相关载荷的理论表达式。针对旋转坐标系下系统的耦合性,采用坐标变换将系统转换到固定坐标系,设计了固定坐标系下的2P载荷的控制方法。2P载荷控制策略是利用安装在叶轮上的载荷传感器得到的不平衡载荷实时值作为反馈信号,最终采用控制器实现载荷控制的实时反馈。研究结果表明:基于状态反馈的2P载荷控制与传统1P载荷控制相比,2P谐波分量显著降低,固定部件疲劳载荷明显降低,即基于状态反馈的2P载荷控制策略能够有效降低系统的不平衡载荷。

Aiming at the problems that 1P load control strategy could only reduce the 1P harmonic component of the blade and the 0P harmonic component of the hub could not restrain the high frequency vibration,a 2P load control method was applied to reduce the imbalance loads. By studying the dynamic characteristics of wind turbine and the equivalent linear model,theoretical dynamic equations and related loads equations of wind turbine was deduced. Due to the coupling of the system in the rotating coordinate,it was necessary to convert the system to the fixed coordinate through coordinate transformation so that the 2P load control method was applied appropriately. Using the load sensor mounted on the impeller,unbalanced load value was obtained as feedback signal,and state feedback controller was used to ensure real time load control. The results indicate that comparing with traditional 1P load control strategy the proposed method can effectively reduce the imbalance loads such as the 2P harmonic component of rotating parts and fatigue loads of fixed parts.